A cell that has the ability to replicate itself as well as has ability to form other cells of the body is called a stem cell. Two major classifications are there. Embryonic stem cell, which has ability to form any cell of the body, and adult stem cell, which has ability to form only a limited range of cells of the body. A simple explanation of a stem cell is this. Stem cell is like a blank cell. It can eventually become any cell you want. For our purpose, It is enough to know that when a stem cell is introduced in to scalp, it becomes a follicle just like any other surrounding hair follicle.
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